Every Impossible Shape, Explained

A triangle where every corner is a right angle. A staircase that only goes up, forever. A bottle with no inside. This video walks through every classic impossible shape — the Penrose triangle, the devil's fork, Escher's endless staircase and waterfall, the Klein bottle, Alexander's horned sphere, and the Banach-Tarski paradox — and shows exactly where each one breaks, and why. #math #geometry #opticalillusion